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静钻根植竹节桩是一种由预制桩和水泥土组合而成的组合桩基,通过将预制桩和水泥土的复合弹性模量作为其桩身弹性模量,同时考虑桩身弹性模量沿桩身改变以及桩端水泥土扩大头的作用,采用理想弹塑性荷载传递函数提出了一种在均匀地基中静钻根植竹节桩单桩沉降计算方法。在此基础上,提出了静钻根植竹节桩在层状地基中荷载-位移曲线的递推计算方法。用所提出的计算方法对实际工程中的静钻根植竹节桩试桩的荷载-位移曲线进行计算,并与实测曲线进行比较,验证了所提计算方法的可靠性。选取土体基于预制桩的桩侧摩阻力值作为静钻根植竹节桩的侧摩阻力,计算所得极限承载力与实测极限承载力接近,说明静钻根植竹节桩桩-土接触面摩擦性质与预制桩桩-土接触面摩擦性质相似,且优于钻孔灌注桩桩-土界面摩擦性质。
The static drilling root bamboo stake is a kind of combined pile foundation composed of precast pile and cement soil. By taking the composite elastic modulus of precast pile and cement soil as the elastic modulus of pile body, taking into account the elastic modulus Along with the change of pile body and the role of head of soil cement at the pile end, a method of settlement calculation of single rooted bamboo-socketed pile in a uniform foundation is proposed by using the ideal elasto-plastic load transfer function. On this basis, the recursive calculation method of load-displacement curve of static drilling rooted bamboo stake in layered soil is proposed. The load - displacement curve of static test rooted bamboo socketed pile in actual project is calculated by the proposed method, and compared with the measured curve, the reliability of the proposed method is verified. The lateral frictional resistance value of the pile based on the precast piles is selected as the lateral frictional resistance of the static bamboo rooted bamboo piles. The calculated ultimate bearing capacity is close to the measured ultimate bearing capacity. The frictional properties of pile-soil contact surface Compared with the prefabricated pile-soil contact surface, the friction properties are better than that of the bored pile-soil interface.